<template>
    <div class="app-container">
        <!-- Note that row-key is necessary to get a correct row order. -->
        <el-table ref="dragTable" v-loading="listLoading" :data="list" row-key="id" border fit highlight-current-row style="width: 100%">
            <el-table-column align="center" label="ID" width="65">
                <template slot-scope="scope">
                    <span>{{ scope.row.id }}</span>
                </template>
            </el-table-column>

            <el-table-column width="180px" align="center" label="Date">
                <template slot-scope="scope">
                    <span>{{ scope.row.timestamp | parseTime('{y}-{m}-{d} {h}:{i}') }}</span>
                </template>
            </el-table-column>

            <el-table-column min-width="300px" label="Title">
                <template slot-scope="scope">
                    <span>{{ scope.row.title }}</span>
                </template>
            </el-table-column>

            <el-table-column width="110px" align="center" label="Author">
                <template slot-scope="scope">
                    <span>{{ scope.row.author }}</span>
                </template>
            </el-table-column>

            <el-table-column width="100px" label="Importance">
                <template slot-scope="scope">
                    <svg-icon v-for="n in +scope.row.importance" :key="n" icon-class="star" class="icon-star"></svg-icon>
                </template>
            </el-table-column>

            <el-table-column align="center" label="Readings" width="95">
                <template slot-scope="scope">
                    <span>{{ scope.row.pageviews }}</span>
                </template>
            </el-table-column>

            <el-table-column class-name="status-col" label="Status" width="110">
                <template slot-scope="{row}">
                    <el-tag :type="row.status | statusFilter">
                        {{ row.status }}
                    </el-tag>
                </template>
            </el-table-column>

            <el-table-column align="center" label="Drag" width="80">
                <template slot-scope="{}">
                    <svg-icon class="drag-handler" icon-class="drag"></svg-icon>
                </template>
            </el-table-column>
        </el-table>
        <div class="show-d">
            <el-tag>The default order :</el-tag> {{ oldList }}
        </div>
        <div class="show-d">
            <el-tag>The after dragging order :</el-tag> {{ newList }}
        </div>
    </div>
</template>

<script>
    import { fetchList } from '/vue/api/article.js';
    import Sortable from '/vue/libs/Sortable.min.js';
    module.exports = {
        name: 'DragTable',
        filters: {
            statusFilter(status) {
                const statusMap = {
                    published: 'success',
                    draft: 'info',
                    deleted: 'danger'
                }
                return statusMap[status]
            }
        },
        data() {
            return {
                list: [],
                total: null,
                listLoading: true,
                listQuery: {
                    page: 1,
                    limit: 10
                },
                sortable: null,
                oldList: [],
                newList: []
            }
        },
        created() {
            this.getList();
        },
        methods: {
            async getList() {
                this.listLoading = true
                const { data } = await fetchList(this.listQuery)
                this.list = data.items
                this.total = data.total
                this.listLoading = false
                this.oldList = this.list.map(v => v.id)
                this.newList = this.oldList.slice();
                this.$nextTick(() => {
                    this.setSort()
                })
            },
            setSort() {
                const el = this.$refs.dragTable.$el.querySelectorAll('.el-table__body-wrapper > table > tbody')[0]
                this.sortable = Sortable.create(el, {
                    ghostClass: 'sortable-ghost', // Class name for the drop placeholder,
                    setData: function (dataTransfer) {
                        // to avoid Firefox bug
                        // Detail see : https://github.com/RubaXa/Sortable/issues/1012
                        dataTransfer.setData('Text', '')
                    },
                    onEnd: evt => {
                        const targetRow = this.list.splice(evt.oldIndex, 1)[0]
                        this.list.splice(evt.newIndex, 0, targetRow)

                        // for show the changes, you can delete in you code
                        const tempIndex = this.newList.splice(evt.oldIndex, 1)[0]
                        this.newList.splice(evt.newIndex, 0, tempIndex)
                    }
                })
            }
        }
    }
</script>

<style>
    .sortable-ghost {
        opacity: .8;
        color: #fff !important;
        background: #42b983 !important;
    }
</style>

<style scoped>
    .icon-star {
        margin-right: 2px;
    }

    .drag-handler {
        width: 20px;
        height: 20px;
        cursor: pointer;
    }

    .show-d {
        margin-top: 15px;
    }
</style>

